mysql报错ERROR 1045 (28000)

新安装了一个mysql,创建了一个新的用户dadmin,授予ALL权限
mysql>GRANT ALL ON *.* TO 'dadmin'@'localhost' IDENTIFIED BY '123456';

mysql>DROP USER 'root'@'localhost';
mysql>DROP USER 'root'@'localhost.localdomain';
mysql>DROP USER 'root'@'::1';
mysql>DROP USER 'root'@'127.0.0.1';

后面才想起来,忘记给'dbaadmin'@'%'远程权限，然后开始授权
mysql> GRANT ALL ON *.* TO 'dadmin'@'%' IDENTIFIED BY '123456';
ERROR 1045 (28000): Access denied for user 'dadmin'@'localhost' (using password: YES)

出现这个问题，这样解决：
mysql>use mysql
mysql> update user set grant_priv = 'Y' where user = 'dadmin';
Query OK, 1 row affected (0.03 sec)
Rows matched: 1 Changed: 1 Warnings: 0

mysql> commit;
Query OK, 0 rows affected (0.00 sec)

mysql> flush privileges;
Query OK, 0 rows affected (0.02 sec)

mysql> quit //退出，再次连接
Bye
[root@localhost ~]# mysql -udadmin -p
Enter password:
Welcome to the MySQL monitor. Commands end with ; or \g.
Your MySQL connection id is 171
Server version: 5.6.13-log MySQL Community Server (GPL)

Copyright (c) 2000, 2013, Oracle and/or its affiliates. All rights reserved.

Oracle is a registered trademark of Oracle Corporation and/or its
affiliates. Other names may be trademarks of their respective
owners.

Type 'help;' or '\h' for help. Type '\c' to clear the current input statement.

mysql> GRANT ALL ON *.* TO 'dadmin'@'%' IDENTIFIED BY '123456';
Query OK, 0 rows affected (0.03 sec)

mysql> show grants for 'dbaadmin'@'%'; //授权成功
+------------------------------------------------------------------------------------------------------------------+
| Grants for dadmin@% |
+------------------------------------------------------------------------------------------------------------------+
| GRANT ALL PRIVILEGES ON *.* TO 'dbaadmin'@'%' IDENTIFIED BY PASSWORD '*ED09FA20652595D6114A30C5045A520B8A39839C' |
+------------------------------------------------------------------------------------------------------------------+
1 row in set (0.00 sec)